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<h1 class="topictitle1">恢复虚拟机或磁盘时，恢复失败</h1>
<div><div class="section"><h4 class="sectiontitle">现象描述</h4><p>虚拟机恢复或者磁盘恢复时，恢复任务失败。任务详情提示错误“恢复虚拟机磁盘失败”，日志中出现“Write failed, err: 'Unknown error'”错误。</p>
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<div class="section"><h4 class="sectiontitle">可能原因</h4><p>SAN传输模式恢复场景下，如果待恢复副本磁盘类型包含厚置备延迟置零或者精简置备磁盘，则可能出现写I/O错误。（详见VMware KB：<a href="https://kb.vmware.com/s/article/52193" target="_blank" rel="noopener noreferrer">https://kb.vmware.com/s/article/52193</a>）</p>
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<div class="section"><h4 class="sectiontitle">处理步骤</h4><ol><li><span>选择<span class="uicontrol" id="vmware_gud_0134__zh-cn_topic_0000002199964685_uicontrol1812933174613">“<span id="vmware_gud_0134__zh-cn_topic_0000002199964685_text0129103112462">数据利用</span> &gt; <span id="vmware_gud_0134__zh-cn_topic_0000002199964685_text81291431134613">副本数据</span> &gt; <span id="vmware_gud_0134__zh-cn_topic_0000002199964685_text860175510430">虚拟化</span> &gt; <span id="vmware_gud_0134__zh-cn_topic_0000002199964685_text8319371528">VMware</span>”</span>。</span></li><li><span>在<span class="wintitle">“副本”</span>页签，选择待恢复的副本。</span><p><ul><li>虚拟机恢复：选择“操作 &gt; 恢复”，在恢复界面打开<span class="uicontrol">“NBDSSL恢复”</span>开关。</li><li>磁盘恢复：勾选待恢复磁盘，单击“恢复”。在恢复界面打开<span class="uicontrol">“NBDSSL恢复”</span>开关。</li></ul>
</p></li><li><span>单击<span class="uicontrol">“确定”</span>，启动恢复任务。</span></li></ol>
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